NPS
MANDATORY for Data Store: NPS Alpha Unit Code (ACAD)
MANDATORY for Data Store: NPS Unit Type (National Park, National Monument, etc)
GISDATA.IWPA_POLY_DISSOLVE
36589.466006
329046.059656
777915.277016
952083.599933
Simple
FALSE
91
TRUE
FALSE
Interim Wellhead Protection Areas (IWPA)
Feature Class
91
Shape_Length
OBJECTID
OID
4
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
SHAPE
Feature geometry.
ESRI
Coordinates defining the features.
Shape_Area
Double
8
0
0
SHAPE_AREA
Shape
Geometry
0
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
Shape_Length
Double
8
0
0
In the absence of an Approved Wellhead Protection Area (Zone II), the MA DEP has adopted the Interim Wellhead Protection Area (IWPA) as the primary, protected recharge area for public water supply (PWS) groundwater sources in Massachusetts. For PWS sources that pump less than 100,000 gallons per day (GPD), the IWPA radius is proportional to the pumping rate in gallons per minute (GPM). Pumping rate is based on of several methods including, DWP approved pumping rate, metered data, Title 5 flow rate. The formula used for calculating the PWS well point buffer radius in feet is:
Radius = ( 32 x pumping rate in GPM ) + 400
The minimum IWPA radius is 400 feet, the maximum (default) radius reached at 100,000 GPD (70 GPM) is 2,640 feet (1/2 mile). In instances where pumping rate information is unavailable default radius values are assigned based on the PWS well classification. The default radius for community class PWS groundwater sources (GW) is 2,640 feet (804.6 meters). The default radius for non-community sources is 750 feet (228.6 meters) for Non Transient (NTNC) wells and 500 feet (152.4 meters) for Transient (TNC) wells. The IWPA layer contains variable width IWPAs for BOTH community and non community groundwater sources in the DEP PWS datalayer which do not have an approved Zone II. IWPA features are generated by buffering PWS well point locations in the DEP Public Water Supply datalayer (PWSDEP_PT) based on radius values determined from the best available pumping rate information. The IWPA features are relatable to the PWS source points by SOURCE_ID.
As of the August 28, 2003 update, the DEP GIS Program dropped the IWPACOM layer; currently only the IWPA layer is being maintained.
20140417
13250600
FALSE
20221229
09433400
20221229
9442800
CapeIWPA_POLY_DISSOLVE
002
275128.810000
329046.059700
818066.441000
868170.337500
1
0.000
Projected
GCS_North_American_1983
NAD_1983_StatePlane_Massachusetts_Mainland_FIPS_2001
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Linear Unit: Meter (1.000000)
1.0
ISO 19139 Metadata Implementation Specification
500000
5000
ISO19139
Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9328
Interim Wellhead Protection Areas (Dissolved)
2022-11-03T00:00:00
Aaron T. Richer
Department of Environmental Protection
1 Winter St.
Boston
MA
02108
aaron.richer@state.ma.us
US
(617) 574-6856
Aaron T. Richer
Aaron T. Richer
-70.598695
-69.940989
42.060334
41.602282
1
36589.466006
329046.059656
952083.599933
777915.277016
1
MassDEP Update
-73.497775
-69.922239
42.819366
41.234516
1
002
Planning and analysis
Cliped from the state-wide feature by the Cape Cod Commission staff, December 29, 2022.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>In the absence of an Approved Wellhead Protection Area (Zone II), the MA DEP has adopted the Interim Wellhead Protection Area (IWPA) as the primary, protected recharge area for public water supply (PWS) groundwater sources in Massachusetts. For PWS sources that pump less than 100,000 gallons per day (GPD), the IWPA radius is proportional to the pumping rate in gallons per minute (GPM). Pumping rate is based on of several methods including, DWP approved pumping rate, metered data, Title 5 flow rate. The formula used for calculating the PWS well point buffer radius in feet is: Radius = ( 32 x pumping rate in GPM ) + 400 The minimum IWPA radius is 400 feet, the maximum (default) radius reached at 100,000 GPD (70 GPM) is 2,640 feet (1/2 mile). In instances where pumping rate information is unavailable default radius values are assigned based on the PWS well classification. The default radius for community class PWS groundwater sources (GW) is 2,640 feet (804.6 meters). The default radius for non-community sources is 750 feet (228.6 meters) for Non Transient (NTNC) wells and 500 feet (152.4 meters) for Transient (TNC) wells. The IWPA layer contains variable width IWPAs for BOTH community and non community groundwater sources in the DEP PWS datalayer which do not have an approved Zone II. IWPA features are generated by buffering PWS well point locations in the DEP Public Water Supply datalayer (PWSDEP_PT) based on radius values determined from the best available pumping rate information. The IWPA features are relatable to the PWS source points by SOURCE_ID. This layer is a dissolved version of GISDATA.IWPA_POLY.</SPAN></P></DIV></DIV></DIV>
MassDEP. 11/03/2022
Public Water Supply (PWS) Interim Wellhead Protection Areas (IWPA)
Cape Cod
Massachusetts
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>None</SPAN></P></DIV></DIV></DIV>
Aaron T. Richer
Department of Environmental Protection
1 Winter St.
Boston
MA
02108
aaron.richer@state.ma.us
US
(617) 574-6856
Aaron T. Richer
Aaron T. Richer
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
Shapefile
ArcGIS 10
Download from https://www.mass.gov/info-details/massgis-data-massdep-wellhead-protection-areas-zone-ii-zone-i-iwpa
Michael Trust
MassGIS
Sr. GIS Database Administrator
One Ashburton Place, Room 1601
Boston
MA
02108
US
617-619-5615
Michael Trust
File Geodatabase Feature Class
ArcGIS 10
0.000
NAD_1983_StatePlane_Massachusetts_Mainland_FIPS_2001
EPSG
2.1(3.0.1)
91
20221103
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Aaron T. Richer
Department of Environmental Protection
1 Winter St.
Boston
MA
02108
aaron.richer@state.ma.us
US
(617) 574-6856
Aaron T. Richer
Aaron T. Richer